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Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
parents 355632dca928
children
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>SDL_Delay</TITLE
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>SDL_Delay</H1
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><H2
>Name</H2
>SDL_Delay&nbsp;--&nbsp;Wait a specified number of milliseconds before returning.</DIV
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><PRE
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>#include "SDL.h"</PRE
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><CODE
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>void <B
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>SDL_Delay</B
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>(Uint32 ms);</CODE
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>Description</H2
><P
>Wait a specified number of milliseconds before returning. <TT
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>SDL_Delay</TT
> will wait at <SPAN
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>least</I
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> the specified time, but possible longer due to OS scheduling.</P
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><B
>Note: </B
>Count on a delay granularity of <SPAN
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> 10 ms.
Some platforms have shorter clock ticks but this is the most common.</P
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